The game was really good up until a certain point and then it just jumped the shark; Sally immediately going into Kien's apartment and grabbing him by the neck after her call with the locksmith came out of nowhere. It broke the immersion and took me out of the story. That's just not how people behave in the real world.
I understand her getting angry at him, maybe even going over to his place to give him a piece of her mind (although that seems unwise after what she just learned on the phone), but for her to start choking him out appears unhinged and goofy. Maybe if you want to put a scene like that in the game it should occur for later after a few more incidents of Kien showing problematic behavior. Everything up to this point has characterized Sally as someone who wants to avoid conflict, not a person who resorts to violence when right away.
Edit: I've read some of the comments on here and found out the game is complete. It really gives the impression of being a demo. I would seriously advise working on the ending a bit. It just doesn't feel complete, even for a cliffhanger.